Azo dye.



- ARTHUR ZART, 0F VOIEIWINKEL,

NITE STATES PATENT OFFICE NEAR ELBERFELD, GERMANY, ASSIGNdR T0 FARBEN- FAIBR-IKEN VORM. FRIEDBI. BAYER 8c (10., OF ELBERFELD, GERMANY, A CORPORA- TIDN' 0F GERMANY.

omers.

No Drawing.

Specification of Letters Patent. Application filed June 6, 1911. Serial No. 631,553.

Azo DYE.

Patented Jan, 23, 1912.

To all whom it may concern; I 5 Be it known that I, ARTHUR ZART, doctor of philosophy, chemist, citizen of the Ger man Emdpire, residing at Vohwinkel, near Elber'fel Germany, have invented new and useful Improvements in Azo Dye, of which the following is a specification. i

My invent-ion relates to the. manufacture and production of new azo coloring matters having most probably the following general formula: I

R rneanim an .arylcarbonyl-fz-amino-fi-naphthol-7sultonic acid, such as benzoylor para anisoyl-2-amino-5-naphtho1 7 sulfonlc acid, etc. They are obtained by combining d1azotized Q'amino arylcarbonylamino 5 naphthol-T-sulfonic acids with the symmetrical urea of 2.5.7-aminonaphthol sulfonic acid.

, The new dyes are after being dried and pulverized in the shape of their alkalinev salt reddish powders easily soluble in water. They yield upon reduction with stannous chlorid and hydrochloric acid an aminoarylcarbonyl-2-amino-5naphthol 7-su1fonic acid and the asymmetrical urea of 2.6 -diamino-5- naphthol-T-sulfonic acid and 2 amino 5- naphthol-T-sulfdnic acid. They dye cotton orange to red shades which can be combined on fiber with diazotized para-nitranilin from orangemed to scarlet shades being thus obtained which are fast to washing and can bedischarged to a good white.

In order to illustrate the new process more fully the following example is given, the

parts beingby weightz-358 partsiof 2-paraammobenzoylamino 5 naphthol-7 sulfonic acid are. diazotized with 69 parts of sodium nitrite and hydrochloric acid and the resulting diazo compound is combined with a solution of 50a parts of the asymmetrical urea of 2-amino-5-naphthol-7 sulfonic acid:

not of the reaction is slowly rendered alka,

line by the addition of sodium carbonate;

it is then heated and the azo dye is salted ti ed para-nitranilin. tamed 1s fast to washing and can be dis- 70 acid with a bluish-red color. By reduction with stannous chlorid and hydrochloric acid the dye is decomposed, 2-para-aminobenzoylamino5-naphth0l-7-sulfonic acid and the asymmetrical urea of 2.6-diamino-5-naphthol-7-sulfonic acid and 2.5.7-aminonaphthol sulfonic acid are obtained. It dyes cotton orange-red shades, changing into a pure yellowish-scarlet by development with diazo- The shade thus obcharged to a pure white with hydrosulfite.

The azo dye obtained from Q-mcta-aminobenzoylammo 5 naphthol 7 -sulfonic acid .dyescotton orange-red yielding a scarlet by developing the dyed fiberwith diazotized para-nitranilin. On using meta-amino-parae anisoyl-2-amino-5 naphthol-7-sulfonic acid somewhat more bluish shades are obtained.

I claim l. The herein described new azo dyestuffs having most probably the formula:

alkaline salts reddish powders easily soluble 9O in water; yielding upon reduction with stannous chlorid. and hydrochloric acid an amino arylcarbonyl-2-ammo- 5 naphthol-7-sulfonic acid and the asymmetrical urea of ,2.6-diamino-5-naphthol-7-sulfonic acid and the 2.5.7 9

aminonaphthol'sulfonic acid; dyeing cotton orange to red shades which can be combined onfiber with diazotized para-nitranilin from;

orange-red to scarlet shades which are fast.

to washing and can'be discharged to a pure white,substantially "as described;

2. The herein described new azo dyestuffhaving most probably the formula:

(R meaning Q-benzoylaminofi-haphthol-7- sulfonic acid) which is after being dried and 1 1 q T-soan 10 dark reddish powder, soluble in water with pulverized in the shape of its sodium salt a an orange color and soluble in concentrated sulfuric acid with a bluish-red color; yielding upon reduction with stannous chloridby development with diazotized para-nitranilin which are fast to Washing and can be discharged to a pure white with hydrosulfite, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ARTHUR ZART. [1,. s.] Witnesses ALBERT F. NUFER, ALFRED HENKEL. 

